C-shaped apertures in a metal film, were made to be resonant at visible wavelengths. They showed transmission enhancement of 22 times over a square aperture of the same area. This resonance was tuned over 70nm.
© 2004 Optical Society of America
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1220) Diffraction and gratings : Apertures
(300.0300) Spectroscopy : Spectroscopy
(300.6550) Spectroscopy : Spectroscopy, visible
J. A. Matteo, D. P. Fromm, Y. Yuen, P. J. Schuck, W. E. Moerner, and L. Hesselink, "Spectral study of enhanced transmission through single C-shaped nano-apertures," in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, Technical Digest (CD) (Optical Society of America, 2004), paper IWA34.